At 07:21 AM 8/16/2008 -0700, mdrillock wrote:
>I think it is for the negative lead to the optional flame meter found in
>early years. The old flame meter uses the nearby spade on the top end of
>the thermocouple as it's positive lead. This positive lead is later used
>for the flame LED though many times here people have wrongly referred to
>it as a ground. Frank Condelli's Dometic writeup perpetrates this error.
>It is not a ground at all, but a positive voltage source for the LED
>flame indicator.

A clarification here -- the "live" terminal from the thermocouple to
the LED/meter actually goes a few hundred millivolts negative to
chassis ground (when the thermocouple is hot), rather than positive.

Cheers,
David

--
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage," '85 GL "Poor Relation"